9469300994 5-1
DGC-2020HD Voltage and Current Sensing
5 • Voltage and Current Sensing
The DGC-2020HD senses generator voltage, generator current, and bus voltage through dedicated,
isolated inputs.
Generator Voltage
The DGC-2020HD accepts either line-to-line or line-to-neutral generator sensing voltage over the range
of 12 to 576 volts rms L-L (7 to 333 volts rms L-N). Single-phase generator voltage is sensed across
phases A and B. Generator voltage sensing terminals are listed in Table 5-1.
Table 5-1. Generator Voltage Sensing Terminals
A-phase generator voltage sensing input
B-phase generator voltage sensing input
C-phase generator voltage sensing input
Neutral generator voltage sensing input
Bus Voltage
Sensing of bus voltage enables the DGC-2020HD to detect failures of the mains (utility). The
DGC-2020HD accepts bus sensing over the range of 12 to 576 volts rms L-L (7 to 333 volts rms L-N).
Controllers with style number xxx2xxxxx measure bus voltage sensing to perform automatic
synchronization of the generator with the bus. Single-phase bus voltage is sensed across phases A and
B. Bus voltage sensing terminals are listed in Table 5-2.
Table 5-2. Bus Voltage Sensing Terminals
Bus 1 A-phase voltage sensing input
Bus 1 B-phase voltage sensing input
Bus 1 C-phase voltage sensing input
Bus 1 Neutral voltage sensing input
Bus 2 A-phase voltage sensing input
Bus 2 B-phase voltage sensing input
Bus 2 C-phase voltage sensing input
Bus 2 Neutral voltage sensing input
Generator and Bus Current
The DGC-2020HD has sensing inputs for A-phase, B-phase, and C-phase generator current. One, or up
to four (optional), user-programmable CTs are provided for sensing current on bus 1, optional bus 2, and
generator ground current. Depending on the style number, a DGC-2020HD has a nominal sensing current
rating of 1 Aac or 5 Aac. A style number of 1xxxxxxxx indicates 1 Aac nominal current sensing and a style
number of 5xxxxxxxx indicates 5 Aac nominal current sensing. Generator current sensing terminals are
listed in Table 5-3 and load bus current sensing terminals are listed in Table 5-4.
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